You may wish to read the following article from the religious Journal
First Things written by the late Cardinal Avery Dulles entitled “The Population of Hell”. I quote from it to show how some Catholics, including Cardinals, have written of Hell. The Catechism is clear on Hell, but throughout the Church’s history theologians, even a prominent one such as the late Hans Urs von Balthasar in his book Dare We Hope “That All Men Be Saved? have revealed some interesting thoughts on hell. Balthasar kept company with the last pope and the current. Here from Cardinal Dulles’ article which caused some discussion:
*"Sometimes the complaint is heard that no one preaches about hell any longer. The subject of hell, if not attractive, is at least fascinating, as any reader of Dante’s Inferno or Milton’s Paradise Lost can testify. Equally fascinating, and decidedly more pressing, is the question of how many of us may be expected to go there when we die.
Mention should here be made of a minority opinion among some of the Greek Fathers. Clement of Alexandria, Origen, Gregory Nazianzen, and Gregory of Nyssa sometimes speak as though in the end all will be saved. Origen, the most prominent representative of this view, is generally reported as teaching that at the end of time, the damned, now repentant and purified, will take part in the universal restoration of all things (apokatastasis).
The most sophisticated theological argument against the conviction that some human beings in fact go to hell has been proposed by Hans Urs von Balthasar in his book Dare We Hope “That All Men Be Saved?” He rejects the ideas that hell will be emptied at the end of time and that the damned souls and demons will be reconciled with God. He also avoids asserting as a fact that everyone will be saved. But he does say that we have a right and even a duty to hope for the salvation of all, because it is not impossible that even the worst sinners may be moved by God’s grace to repent before they die. He concedes, however, that the opposite is also possible. Since we are able to resist the grace of God, none of us is safe. We must therefore leave the question speculatively open, thinking primarily of the danger in which we ourselves stand.
This position of Balthasar seems to me to be orthodox. It does not contradict any ecumenical councils or definitions of the faith. It can be reconciled with everything in Scripture, at least if the statements of Jesus on hell are taken as minatory rather than predictive. Balthasar’s position, moreover, does not undermine a healthy fear of being lost. But the position is at least adventurous. It runs against the obvious interpretation of the words of Jesus in the New Testament and against the dominant theological opinion down through the centuries, which maintains that some, and in fact very many, are lost.
Pope John Paul II in his Crossing the Threshold of Hope mentions the theory of Balthasar. After putting the question whether a loving God can allow any human being to be condemned to eternal torment, he replies: “And yet the words of Christ are unequivocal. In Matthew’s Gospel he speaks clearly of those who will go to eternal punishment (cf. Matthew 25:46).”
The constant teaching of the Magisterium has been that unrepentant sinners are sent to eternal punishment. Judas must be in hell unless he repented. It is unfair and incorrect to accuse either Balthasar or Neuhaus of teaching that no one goes to hell. They grant that it is probable that some or even many do go there, but they assert, on the ground that God is capable of bringing any sinner to repentance, that we have a right to hope and pray that all will be saved. The fact that something is highly improbable need not prevent us from hoping and praying that it will happen. According to the Catechism of the Catholic Church, “In hope, the Church prays for ‘all men to be saved’ (1 Timothy 2:4)” (CCC §1821). At another point the Catechism declares: “The Church prays that no one should be lost” (CCC §1058).
We know that in all things God works for the good of those who love Him, and that if we persevere in that love, nothing whatever can separate us from Christ (cf. Romans 8:28-39). That is all the assurance we can have, and it should be enough."*
The full article is here:
firstthings.com/article/2008/08/the-population-of-hell-23
The Church teaching on Hell is firm, but as for the population of it and its meaning, the Cardinal’s article reveals that the subject of Hell is studied from many angles by theologians and clergy.